Internacional and Gremio captains, Andres D'Alessandro and Maicon Souza, needed to be restrained by officials before the Brazilian city derby.
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As part of the agreement, Barca say they have the right to sign Arthur in July for an upfront fee of €30m plus an additional €9m in potential add-ons.
As full-time inches closer to the illustrious career of Andres Iniesta, Barcelona are on the verge of signing his heir apparent in Gremio's Arthur.
Representatives of Brazilian club Gremio flew to Barcelona on Monday with the aim of finalising a deal for 21-year-old.
Douglas Costa revealed that he and his Gremio teammates felt compelled to throw a game against Flamengo in 2009 out of fear for their lives.
Brazilian side Gremio have defeated Argentina's Independiente 5-4 in a penalty shootout.
Barcelona have reached an agreement with Gremio to sign midfielder Arthur in a deal which could reach €40 million, sources tell ESPN Deportes.
Real Madrid defeated Gremio 1-0 to lift the Club World Cup and illustrate just how far ahead European clubs are compared to the rest of the world.
Real Madrid were pushed by determined Gremio in the Club World Cup final, but Cristiano Ronaldo again made the big moment his, writes Dermot Corrigan.
Cristiano Ronaldo scored from a free kick to help Real Madrid beat Gremio 1-0 to claim the Club World Cup in Saturday's final in Abu Dhabi.
Real Madrid coach Zinedine Zidane says Saturday's Club World Cup final against Gremio in Abu Dhabi is a 50/50 game.
Gremio's president says Barcelona have not made an offer for midfielder Arthur, who appeared in leaked images wearing their shirt.
Underdogs Gremio are not equipped to outplay Real Madrid but if they follow the plan they may have a chance to outscore them in Club World Cup final.
An extra-time goal by Everton saw Gremio advance to the Club World Cup final, where they will hope to draw giants Real Madrid for the title.
Brazil's Gremio defeated Mexico's Pachuca 1-0 in extra-time to advance to the Club World Cup final on Tuesday.
Gremio know the recipe for a shock success at the FIFA Club World Cup but nowadays following it is much easier said than done.
Gremio's Arthur has confirmed he is in contact with Barcelona but denied there is already an agreement in place for him to move to the Camp Nou.
Barcelona directors Robert Fernandez and Andre Cury have been pictured with Gremio midfielder Arthur, who was wearing the Catalan club's home shirt.
A 2-1 victory in the second leg delivered a third Copa Libertadores to Gremio, who would have none of another miracle Lanus comeback.
Lanus, who needed to score four times in 45 minutes to reach the final, will have to come up clutch again in Wednesday's second leg versus Gremio.
It wasn't the most exciting football, but Cicero's late goal gave Gremio a 1-0 victory over Lanus in the first leg of the Copa Libertadores final.
Brazilian side Gremio edged Lanus of Argentina 1-0 in a tense first leg of their Copa Libertadores final in Porto Alegre on Wednesday.
Brazilian side Gremio secured their third Copa Libertadores title 3-1 on aggregate after a 2-1 second leg final victory over Lanus on Wednesday.